private void LUTHost_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
 {
     dragStart = null;
     PointReleasedEvent?.Invoke();
     this.ReleaseMouseCapture();
 }
 private void LUTHost_MouseLeave(object sender, MouseEventArgs e)
 {
     PointReleasedEvent?.Invoke();
     dragStart = null;
     this.ReleaseMouseCapture();
 }